Signaling-jack for multiple-telephone exchanges.



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SIGNALING JAGK'EOR MULTIPLE TELEPHONE EXCHANGES.

APPLICATION FILED FEB. 12, 19'01.

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PATENTED JUNE 2,1993. l

No. 729,560. f y

f L. M.EE10ss0N. 'SIGNALING JACK EOE MULTIPLETELEPEONE EXCHANGES.

rrLIoA'rIoN EILED' EEE. 12,' 1901. A11o IODEL. 2 SHEETS-SHEET 2.

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UNITE-D i STATES Patented June 2, 1903.

ATENT {OFFICE LARS MAGNUS ERICSSON, OF STOCKHOLM, SWEDEN, ASSIGNOR TO AKTIE- BOLAGET L. M. ERICSSON &'CE.,- OF STOCKHOLM, SWEDEN.`

slcNALlNe-JAQK Fos MULTIPLEaTsLx-:PHONE EXCHANGES.

SPECIFICATION forming part of Letters Patent No. 729,560, dated June 2, 1903. Application yfiled FebruarylZ, 190].. Serial-No. 47,039. (No modell To all whom-zit may concern/ Be it known that I, LARs MAGNUS Eines- SON, manufacturer, asubject of the King of Sweden and Norway, and a resident of Thut legatan 5, Stockholm, in the Kingdom of Swe-j den, have invented certain new and useful. Improvements'in Signaling-Jacks for Multi-t ple-Telephone Exchanges, `(for which I have tiled applications for patent in Sweden the 8th day of August, 1900, under No. 1,327/00; in Austria the th day of October, 1900; in Hungary the 17th day of October, 1900, under No. 14,527; in Great Britain the 24th day of December, 1900, under No. 23,610; in Nori5 way the 24th day of December, 1900, under No. 13,351; in France the 31st day of December, 1900, under No. 295,175; in Russial the 26th day of-August, [8th of September,].1900, underNo. 11,936; in Germany the 2d day of January, 1901'; in Belgium the 3d day ofJanuary, 1901, under No. 122,067; in Italy the 3d day of January, 1901, under No. SLL/,5, and

in Spain the 4th day of January, 1901,) of.`

which the following :is a specificatiomreference being had therein-to the accompanying drawings.

This invention relates to signaling-jacks for multiple-telephone exchanges.E

In the systems hitherto employed in multiple-telephone exchanges the testing device is usually so contrived that the line of a calling subscriber is indicated as engaged only after the insertion by the operator of a plug-into the corresponding local jack. This often gives rise to unpleasant complications, since connection may be made with the line of a calling subscriber elsewhere in the exchange before the operator has had time to indicate it as engaged. A

The present invention has for its object to cause a subscriberslineto be indicated as engaged by the calling operation itself, this beingfaccomplished bymeans of a combination of annunciator and local vjack with an electromagnetsituated in an extension of the same andutilizedalso for indicating a call. This operation consequently is carried out in a different manner from that hitherto employed. The signaling or indicating part of the j ack has 5o been placed at the forward end of the said jack, being composed of a concentric enlargement of the ordinary jack-tube. This signaling part, which is movable longitudinally, slides forward as the callin g-cu rrent traverses the electromagnet, the call being thereby in- 55 Vdicated to the operator simultaneously with the formation of a larger inlet-aperture in the jack.l

Figures 1 to 6 in the accompanying drawings illustrate the construction of this so- 6o called signaling-j ack as employed in parallel-jack systems. Fig. 1 is a section showing its position immediately after a call. Fig. 2 is a similar view showing its position on the insertion of the answering-plug. Figs. 3 and 4 65 are dierent side views of the signaling or indicating part proper. Fig. 5 is a section on the line A B of Fig. l, taken between the jack and the jack-socket; and Fig. 6 is an end view. Fig. 7 is a diagrammatic view illus- 70 trating the mode of connecting the signalingjack in a series system of jacks. Fig. 8 is a diagrammatic view-illustrating its connection in a parallel-jack system in which some kind of relay is used for cutting out the signaling electromagnet when connection is made with a multiple jack. Fig. 9 is a plan of the guide-socket 4, showing recesses a a.

As will be seen by reference to Figs. 1 and 2 the outer'frame of the signaling-jack is 80 composedof an iron tube 1. This is attached at its forward end to the securing-neck 2, which ,is threaded at its forward end to receive the securing-nut 3. The neck k2 supports in its interior the guide-socket 4 for the 85 Iplug. l Between the said socket and neck is a concentric aperture, in which is located a tubular piece 5, which can move freely. The latter is provided with two prongs .15 and 16, passing through two recesses a a in the shoul- 9 der of the guide-socket 4. In the rear of this part the spring-jack is placed. This consists of the line-springs 31 and 32, the cutting-out spring 33 of the'signaling-electromagnet, the

Acutting-out spring 34. of the relay-electromagnet, the test-line spring 35, andthe test-battery spring 36. In the free space at the side of the line-spring 3l is placed a slide 6, having two arms 13 and 14., in each of which is an insulating-piece 13a 14, which under the 100 action of the spiral spring '7 tends to move in the direction of the guide-socket 4. Attached to the slide 6 is a metal band 8, extending outside the frame 1 to the rear end of the latter, where it is retained in its normal position by the catch 9, the slide 6 being thereby kept from moving forward. Close behind the springjack the electromagnet 10 is located. The armature 11 of the latter is suspended in the iron frame and provided with an angularlyprojecting arm 12. When a calling-current traverses the electromagnet which is connected in a suhscribers circuit, the artnature 11 is attracted, and the artn 12 consequently moving upward releases the band from the catch 9. The slide 6 being then driven forward under the action of the spiral spring 7 forces the test-line spring 35 against the testbattery spring 36 by means of its two insulated prongs 13 and 14, at the same timebreaking the contact between the test-line spring 35 and the cutting-out spring 34 of the relayelectromagnet. The said prongs 13 and 14 at the same time are brought in contact with the prongs 15 and 16 of the tubular piece 5, compelling the latter to advance from its pre-- vious concealed position, and thus indicate that a call has been made from the line in question. When the slide 6 advances, on its release it effects a contact between the springs 37 and 38 on the rear piece by means of the metal band S and pin 17. These springs are connected in a local circuit, which, moreover, contains a battery and an indicator 24, Fig. 8, or other visual signal, such as a glow-lamp or the like, common to a certain number of lines-for instance, to all lines in charge of one operator. When the answering-plug is inserted in the jack where a call-signal has appeared, the signaling-tube 5 is pushed by the said plug into its concealed position. By means of the prongs 15 and 16 the slide 6 is then likewise forced back into its normal position, where it is retained by the catch 9. In this operation the test-line spring 35 is released from the action of the slide; but as the plug forces the line-spring 32 slightly aside the latter by means of the insulation 18 will continue to hold the test-,line spring 35 in contact with the test-battery spring 36 as long as the plug remains in the jack.

The construction of the signaling-jack is the same whether it be used for series or parallel-jack systetns, except that, as will be recognized by electricians, the relay device will be replaced in a series system with a spring normally in contact with the line-spring 32, but released from such contact when connection is made in the signaling-jack.

Fig. 8 illustrates the connection of the signaling-jack in a parallel-jack system. -Like parts are indicated by like numerals to those used in Figs. 1 and 2.

In making connection in the local jack 19 the electromagnet-coil l0 is cut out by the plug, directly breaking the contact between battery 21 through the test-springofthe jack,

the test-line 27, and the relay-coil 22, the contact 23, located between one of the doublecircuit branches 26, andthe line-spring 3l in the signaling-jack beingconsequentlybroken. If the local jack 19 in the present instance were to operate in the same manner as a mulple jack, the result would be that an immediate break would be caused by the relay in one of the line branches, this being due to the fact, evident from the above description, that when a call is made the battery 21 will be connected with the test-line v27 through the springs 36 and 35. To avoid such a break, the relay-coil22 is notdirectly connected with the test-line 27, but with the jack-spring 34, which in the normal position of the jack is in contact with the test-line spring 35,while directly a call is made it is released from the said cont-act. When connection has been made in a multiple jack, the relay-coil 22 consequently is always in connection with the test-line 27, whereas in calling, as well as in connecting in the local jack, the relay-coil always becomes disconnected from the test-li no. By this construction the additional advantage is gained that the consumption of current becomes only one-half of what it would be in case the calling-subscribers relay as well were connected in the circuit while a connection lasts.

Fig. 7 also illustrates the construction of the signaling-jack in a multiple-jack system differing from Fig. 8 in representing an arrangement in series instead of in parallel. In the arrangement in series cutting out spring 34 of the relay-electromagnet becomes a spring 34, Fig. 7, in contact with line-spring 32 until connection is made in the signalingjack by insertion of the plug, whereupon said springs separate, thereby cutting out the sigmaling-electromagnet from the line branches. In other respects, as previously stated, the construction of the signaling-jack system is the same for series and parallel-jack systems.

24 denotes the above-mentioned indicator common to a certain number of lines. The test-battery 2lis the common battery.

There is evidently nothing to prevent the use of the signaling-jack in combination with other indicating devices-such as flaps or shutters, relays with glow-lamps, &c.now commonly employed. The function of its electromagnet will then only be to accomplish the disconnection of the test-line from therelay-coil 22 and its connection with the testbattery when a call-signal is given.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a signaling-jack for multiple-telephone exchanges, the combination of an elec- IOO IIO

C tromagnet 10, its armature Vllvhaving the-projecting arm 12a band 8, a vcatch 9"-for normally` retaining said band, springs 34, 35, 36, a'slide 6 attached.Y to said band, having two -prongs 13, 14, to connect springs 35 and 36 and separate springs 34-V and 35, a spring 7 for actuating said slide in 011e direction, a tubularpiece having prongs 15 and 16 and adapted to return said slide into normal position; whereby, upon energizing said magnet, its attracted armature will release band 8 from catch 9 and allow spring 7 to move slide 6 forward; substantially as described and shown.

2. In a signaling-jack for vmultiple-telephone exchanges the combination of an elec-Y tromagnet, armature .with projecting arm, spring-actuated slide having two arms carrying two insulating-arms to make contact between springs and 36 and break contact between springs 35 and 34, avmetal band connected with said, slide, and a catch for normally retaining Said band; the line-springs 3l, 32, the cutting-out, spring 33 ofthe signal-v ing-magnet, the test-line spring 35, test-bate tery spring 36,. and relay cutting-out spring 34; springs 37 and 33, a local battery andan indicator, in a local circuit; tubular piece 5 operated Vby said slide and having the prongs l5 and 16, and guide-socket4 having the two recesses c a for reception of said prongs; substantiallyas described and shown.

In a Signaling-jack for multiple-telephone exchanges the combination of an electromagnet, armature with projecting arm, spring-actuated slide having two arms carrying two insulating-contacts to make contact 31, 32, test-line spring 35, test-battery spring 36, springs 37, 38, a battery and an indicator, all connected in a local circuit, cutting-out spring 34 therefor, a tubular piece 5 operated by said slide and having the prongs l5 and `ot' a call;

. when the ordinarily-used-plug is insertedand of indicating by its protruding end the fact substantially as described and shown.

5. A multiple-signaling jack composed of an electroymagnet, an armaturewith projecting arm, a spring-actuated slide having two rarms. carrying two insulating.- contacts to ,make contact between springs 35 and 36 and rjloreak contact between springs 34 and 35, a

band connected with said slide, a catcht'or normally retaining said band, a securlngneck, a socket for insertion ofthe plug, a longitudinally-movable tube concentricwith and between said neck and Socket, in combination with a test-line spring 35, a relay dekall in. a local circuit, the whole adapted to cut out the signaling-electromagnet bythe movement of said slide, and also to'indicate rthe engagement of a subscrbers line the `m'oment the call is made; substantially as described and shown.

Inwitness whereof I have hereunto' signed Amy name in the presence oftwo subscribing witnesses.

LABS MAGNUS ERICSSON.

Witnesses:

HEMMING JoHANSSoN, E.O. SANDBERG. 

